Adding machine



F. DUBY ADDING MACHINE Sept. 6, 1938.

Filed May 9, 1936 w w M amwflm m WM 0 W F 7 Patented Sept. 6, 1938 UNITED STATES PATENT OFFICE ADDING MACHINE Frederick Duby, Miami, Fla.

Application May 9, 1936, Serial No. 78,903

1 Claim.

My invention relates to improvements in adding machines, and particularly to a small portable adding machine of a type adapted for personal use.

An object of my invention is to provide an adding machine that is small and compact, and is of such form and size that it can be readily held in the hand while being used and can be placed and carried in the pocket or in any other small space, as desired.

Another object is to provide an adding machine structure having a positive and accurate carryover mechanism which dispenses with the use of gearing or other complicated parts or mechanisms that would increase the cost of manufacture and which in use are likely to become unmeshed or otherwise disengaged to render the total sums inaccurate.

Sitll another object is to provide an adding machine structure with which the case and all of the parts can be made of sheet metal stampings, or of parts readily produced upon automatic screw machines, and with which the various parts are readily and inexpensively assembled to thus produce an adding machine that can be sold at low cost.

With the above and other objects in view, which will be apparent to those skilled in the art, my invention includes certain novel features of construction and combinations, arrangements and assemblies of parts, which will be hereinafter set forth in connection with the drawing and then pointed out in the claim.

In the drawing:

Figure 1 is a perspective view showing an adding machine constructed in accordance with my invention.

Fig. 2 is a view in elevation with the front of the case removed.

Fig. 3 is a longitudinal sectional view through the structure substantially on line 3-3 of Fig. 2.

Fig. 4 is a view in elevation of the front or top of the case.

Fig. 5 is a view in side elevation of the member shown in Fig. 4.

Figs. 6 and 7 are transverse sectional views taken through two forms of adding belt structures.

The case I, which is substantially rectangular in plan, can be made up of sheet metal or other suitable material and this case has the side walls 2 and end walls 3 extending forwardly from the back portion 4. A cover portion 5 has side and end walls 6 and l, of similar construction, and the cover portion is preferably made slightly larger than the casing portion I so that the cover will fit telescopically upon the case. As a convenient means for holding the cover upon the case, the case can be provided with indentations 8 to receive correspondingly formed and interfitting bosses 9 provided on the cover, and thus the cover will be held upon the case against accidental or casual displacement.

Shafts IE3 and H are mounted transversely across within the casing structure I between the 10 side walls 2 and slightly spaced from the end walls 3, and these shafts have thereon idler rollers l2 and 13. These idler rollers are adapted to mount idling belts or bands having numbers thereon, and in the present instance I have shown 15; four of these bands, these being respectively the units band Hi, the tens band IS, the hundreds band It, and the thousands band H. The shafts it and t l are intended to remain stationary, and the mounting rollers l2 and I3 for each band will 20 revolve separately and independently of the rollers of any other band, spacing discs 13 being preferably provided on the shafts Ill and H to hold the rollers 12 and IS in properly spaced relation and to prevent endwise contact and conse- 5 quent frictional bearing of one roller against another. At the same time, the belts or bands are spaced and are held from contact at their edges so that ordinarily movement of one band will not in any wise impart or transmit move- 30 ment to, or otherwise affect, any of the other bands.

The several belts or hands l4, !5, I6 and I! are substantially duplicates one of the other, and these bands are made up of thin flexible 35 metal, or of any other desired and suitable material which will travel readily upon the rollers and will permit of the carrying of number designations. The several bands are here illustrated as being made up of a continuous strip of ma- 4 terial provided with a plurality of equally spaced lugs, tabs, or other protuberances or extensions l9, the belt or band carrying or having marked or otherwise shown thereon adjacent to these extensions or protuberances numbers from 1 45 and through 9 to zero. In the present instance I have illustrated the bands as being of sufficient length to accommodate two such numbered series of extensions or protuberances, and it is to be understood that any desired duplication of such series can be employed, the belts or bands being correspondingly lengthened or shortened.

The cover 5 has a series of slots 20, 2|, 22 and 23 formed through the top thereof and lined up to receive and permit travel of the lugs or other protuberances or extensions l9. At their upper ends these several slots are provided with number or sum viewing openings 24, and along their length the slots have numbers shown at spaced points corresponding substantially to the spacing of the protuberances or extensions IQ of the lugs [9 on the belt or band members. These numbers as shown on the top of the cover are made to read from I and increasing upwardly along the length of the slot toward the viewing or window opening 24, and the extensions or protuberances [9' of the lugs l9 are intended to be presented through the slots to travel adjacent to the numbers, as shown at 25 on the upper face or top of the cover. The several slots have lateral extensions 30 at those ends away from the window openings 24, to permit passage of the extensions or protuberances I 9'.

The respective bands or belts I4, l5, l6 and I? will be selectively and separately manipulated as figures are to be added; but, in order that the total may be accurately and completely shown, it is necessary that some carryover mechanism be provided to accumulate and transfer from the right hand column to the next adjacent left hand column as ten points are accumulated. With this in mind, I provide extension carryover pins 26, 21 and 28 upon the three belts or bands l4, l5 and Hi, there being no necessity for a carryover pin for the last belt or band on the left hand side. These pins have extensions 3i projecting in each instance from the left hand side of the belt or band and underneath the next adjacent belt or band to the left, and ordinarily these extension ends of the pins will slide or travel freely below the next adjacent belt without causing any movement of the belt. flowever, as the projecting end of the pin approaches one of the rollers 12 or 3, this projecting end will necessarily be interposed between the outer surface of the roller and the inner face of the corresponding belt or band, in consequence of which the pin will cause the band to be carried over and moved substantially one point or number. With this arrangement, accumulation of ten units on the belt or band M will bring the pin 26 to a position where it will ride between the band 15 and the mounting wheels therefor and will cause the tens band l5 to be moved forward one point. A like result will be accomplished and the parts will function to carry over from the tens to the hundreds column, and from the hundreds to the thousands column.

It will be understood that where the belts or bands have two sets of numbers thereon, each belt or band wil have two of the extension carryover pins 26, 21 and 28. With this construction both carryover pins will function to prevent torque or twisting of the belt or band being manipulated, especially when an addition will cause two or more belts to move at the same time on account of these carryover pins.

Where the ends of the shafts l0 and II project it may be necessary to provide accommodating slots 29 in the side 6 of the cover 5, and otherwise cover and case structure can be made up to suit particular requirements of use.

As illustrated in Fig. 6, the extension or protuberance I9 is cut or stamped from the material forming the belt or web or band, and is bent over or formed to provide an extension that will overlie the upper face of the cover adjacent to the elongated slots therein, and with this construction the several protuberances or extensions will at all times be presented to be readily engaged with the thumb nail, with the finger or in any other manner that may be desired for operation of the machine. In Fig. 7, I have shown the protuberance or extension l9a as set upon or secured to the belt or web portion, and obviously these parts can be constructed in many other manners.

From the foregoing it will be seen that I have provided an adding machine which is of simple and inexpensive construction to thus be manufactured and sold at low cost, which will function accurately and efficiently to add up and total sums in addition, and which is of such construction that there is little likelihood or possibility of the parts becoming damaged or disarranged from use and of the carryover mechanism failing to function.

In lieu of the bands or belts I4, [5, l6 and I1 chains or other link band structures may be employed, the primary function of course being to have a band structure which will carry numbers to be viewed through the window or sum viewing openings 24 and which band portions will at the same time present parts to be available through the several elongated slots for carrying down or adding in any desired number from 1 to 9. As illustrated in Figure l, the elongated slots in the cover may be made to take more than nine spaces and the window or sum viewing opening, and then in a single operation a number greater than 9, as for instance 11 or 12, can be added with a single manipulation in the units column.

While I have shown and described only certain specific and particular embodiments of my invention and have suggested only certain possible modifications, it will be appreciated that many changes and variations can be resorted to in the form, construction, arrangement, assembly, and the materials employed, without departing from the spirit and'scope of my invention.

I claim:

In an adding machine having a plurality of sets of spaced rollers independently revoluble and mounting number carrying bands to be independently movable, carryover pins on each of the bands of lower order having an extension lying beneath the adjacent band of next higher order in position to engage between the band and roller and thereby accomplish carryover movement of the band .of the next higher order when the adjacent lower order band has been moved to accumulate a carryover sum.

FREDERICK DUTBY. 

